---

yaml
---
r: 129790
b: refs/heads/auto
c: 2e4a21c
h: refs/heads/master
v: v3

Author: huonw

[refs]

@@ -13,7 +13,7 @@ refs/heads/try3: 9387340aab40a73e8424c48fd42f0c521a4875c0
 refs/tags/release-0.3.1: 495bae036dfe5ec6ceafd3312b4dca48741e845b
 refs/tags/release-0.4: e828ea2080499553b97dfe33b3f4d472b4562ad7
 refs/tags/release-0.5: 7e3bcfbf21278251ee936ad53e92e9b719702d73
-refs/heads/auto: e3549ee202355731003002e813cf071cd89f04cb
+refs/heads/auto: 2e4a21c2c2cc0702044dabf11d0839e4ed65a079
 refs/heads/servo: af82457af293e2a842ba6b7759b70288da276167
 refs/tags/release-0.6: b4ebcfa1812664df5e142f0134a5faea3918544c
 refs/tags/0.1: b19db808c2793fe2976759b85a355c3ad8c8b336

branches/auto/src/librustc/middle/typeck/check/mod.rs

@@ -2168,12 +2168,13 @@ fn lookup_method_for_for_loop(fcx: &FnCtxt,
         }
     };
 
+    let expr_type = fcx.expr_ty(&*iterator_expr);
     let method = method::lookup_in_trait(fcx,
                                          iterator_expr.span,
                                          Some(&*iterator_expr),
                                          token::intern("next"),
                                          trait_did,
-                                         fcx.expr_ty(&*iterator_expr),
+                                         expr_type,
                                          [],
                                          DontAutoderefReceiver,
                                          IgnoreStaticMethods);
@@ -2184,8 +2185,9 @@ fn lookup_method_for_for_loop(fcx: &FnCtxt,
         Some(ref method) => method.ty,
         None => {
             fcx.tcx().sess.span_err(iterator_expr.span,
-                                    "`for` loop expression does not \
-                                     implement the `Iterator` trait");
+                                    format!("`for` loop expression has type `{}` which does \
+                                             not implement the `Iterator` trait",
+                                            fcx.infcx().ty_to_string(expr_type)).as_slice());
             ty::mk_err()
         }
     };

branches/auto/src/test/compile-fail/for-loop-bogosity.rs

@@ -24,8 +24,7 @@ pub fn main() {
         x: 1,
         y: 2,
     };
-    for x in bogus {    //~ ERROR does not implement the `Iterator` trait
+    for x in bogus { //~ ERROR has type `MyStruct` which does not implement the `Iterator` trait
         drop(x);
     }
 }
-